tharrtell,
according to rumors that have flown around the internet, all winners were invited (except Sandra, since the Pearl Islands winner was unknown until after All Stars was shot), but Vecepia turned it down due to having just had a baby, and Brian allegedly will no longer have anything to do with Survivor.
Elisabeth from S2 and Colleen from S1 were definitely asked - I read it in some official Survivor stuff. I can't remember why Colleen isn't doing it, but Elisabeth just got her gig with The View. I heard 2 different rumors about Paschal English from S4 - the first being that he declined, feeling he was too old to compete {Rudy obviously does not feel the same!}, the second being that ALL previous Survivors except the winners had to re-audition to get onto All-Stars, and Paschal didn't make the cut. Based on official stuff coming out about the show, I think it's clear that the 2nd item was false.
I'm glad that Shii-Ann is getting a 2nd chance - I wish Kel from S2 were on the show. I'd love to see him going up against the Blue Bikini again (Jerri Manthey)! Not looking forward to seeing more of Big Tom from S3 - many folks found him charming, I found him gross. It also has not been long enough for me since having to see Jenna from S6.
2 weeks!!
guinevere